info on an old db

Help I need some info on an old bass that one of my friends just bought. I thought this would be a good place to start.The only info that I have is on a tag inside.It has Antonius Stradivarius Johann Nurnburg then an unreadable word then 1721 . If anyone could tell me anything about it would sure appreciate it thanks!

As near as I can tell from my library, there was no such maker as Johann Nurnberg. However, there was a line of violin family instruments that carried the name Johann Nurberg. These were one of the house brands for the old Cleveland music wholesaler Grossman Music Co. It was common practice for wholesalers to have instruments made for them (usually in Germany) that were labeled by the wholesaler with their brand name. These are called German factory fiddles (or basses) in the trade. I suspect that the name was chosen because it similar to Nurnberger, the famous family of bow and instrument makers.